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发明名称
Drop keel for submarines
摘要
申请公布号
US1764979(A)
申请公布日期
1930.06.17
申请号
US19290380546
申请日期
1929.07.24
申请人
JOHN PLUM
发明人
PLUM JOHN
分类号
B63G8/24
主分类号
B63G8/24
代理机构
代理人
主权项
地址
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